Just to add, SOC has apparently said that he doesn't like bad crimes not being 'punished' which was a huge aspect of DTC's tenure so it might be part of that as well.
I do think that if they had decided to keep Babe in, it would have been left as it was.
I had the impression that the handover period was actually what was on screen. During the early Summer. I might be wrong, but i thought Peggy's death was the last 'full' DTC work with SOC shadowing from that point until his 'full' episodes started airing a couple of weeks ago with the new EP of 'The Archers' doing the same thing over the same period of time. In short, SOC will have been working on both during that time.
I could be completely wrong, but i think that is how it usually works.
Of course long term storylines will be in place and one Producer will continue what a prior one started, but it could be continued in a very different way to what was originally planned. Given the lack of reference to Phil and Denise's ONS for nearly 5 months meant that the pregnancy could have been dropped, or ended quickly via termination had SOC decided he didn't want to continue with it.